of kupfebhammee



(No Model.)

J. O. GRABNER & H. RUPERTI.

STEAM ENGINE.

Patented June 26, 1888.

INVENTOIR WITNESSES ATTORNEYS.

i a single-cylinder engine.

NITED STATES PATENT OFFICE.

JOHANN CARL GRABNER, OF KUPFERHAMMER, AND HENRI RUPERTI, OF

BRAOKWVEDE, ASSIGNORS TO K. PRUSSTA, GERMANY.

82 TH. MDLLER, OF KUPFERHAMMER,

STEAM-ENGINE.

SPECIFICATION forming part. of Letters Patent No. 385,113, dated June26, 1888.

Application filed May 19, 1887.

To all whom iv may concern:

Be it known that we, JOHANN CART. Galin- NER, a subject of the King ofBavaria, residing at Knpferhammer, near Brackwede, and

HENRI RUPERTI, a subject of the G rand Duke of Meeklenburg-Schwerin,residing at Brackwede, Prussia, Germany, have invented new and usefulImprovements in Steam-Engines, of which the following is aspecification.

no This invention relates to an improved construction of cylinder andpiston motor-engines wherein the distribution of the motorfluid-such aspressure steam or vapor and gases, explosive mixtures of the sameliquids, i5 and the like-alternately to either side of the piston iseffected without the use of valves or slides by means ofspeciallyconstructed passages and ports in the cylinders and theirpistons.

In the drawings, Figure 1 is a longitudinal section of a steam cylinderand piston constructed in accordance with my invention. Fig. 2 is across sectional view thereof. Figs. 3 and 4 are similar views of afurther modification.

The invention will be readily understood on referring to theaccompanyingdrawings, which show its application, by way of example, tosingle-cylinder and double-cylinder motor-en o gines. For moresimplicity in the following description steam will be presumed to be themotor-fluid, as this is most frequently used.

Fig. 1 shows a longitudinal section, and Fig. 2 a cross-section, of onearrangement for O is the steanrcyl- 'inder; K, the piston; D, theinlet'port for steam c and c, the exhaust-ports. a a and a a are groovesor recesses at each end of the cylinders walls. The piston K is hollowand 40 has slots 1) and 1). Steam passes from port D,

through slot 1), into the interior of the piston K,which is consequentlyalways filled with fresh steam. In the position of the piston shown atFig. l the steam passes behind the piston and drives it forward-that isto say, to

the right hand. The steam in frontof the piston escapes through theopening 0'. \Vhen the piston has traveled so far that the communicationbetween the slots 1) b and the grooves a a is intercepted, so that nomore steam can Serial No. 238,788. (No model.)

pass behind the piston, the steam previously admitted will expand,causing the piston to complete its stroke. By this motion the front endof the piston is made to close the eX- haust-port 0' before arriving atthe end of its stroke, thus forming a steam-cushion in front of thepiston. Arrived at the end of its stroke, the piston admits steam infront of it through port D, slots 1), and grooves a a, and the piston ismade to perform its return-stroke, the steam behind it being made toescape through port 0, and so on continuously. By admitting steam intothe piston K through slots 7) b the piston is relieved of strain.

Figs. 5 and 6 show, respectively, a longitudinal and transverseseetionof another modification. The cylindrical part of the piston K is in thiscase slit along its entire length, so as to have a certain amount ofspring when in the cylinder, and at each end of the slit are providedclosing-pieces 0, with eylindricallyshaped stuffing-pieces 9, ground soas to fit steamtight against the inner surface of the piston, the endsurfaces of the pieces being also ground so as to fit steam-tightagainst the 7 5 end plates of the piston. The pieces 0 are kept inposition by springs m, of any suitable construction. The spring of thepiston is regulated by the screw-bolt S, passing through lugs on eachside of the slit. I) b are opposite slots operating in conj unotion withthe grooves a a, as previously described with reference to Figs. 1 and2.

The construction shown in Figs. 1 to 4 may be combined to engines havingseveral cylinders. All these constructions may be provided with thewell-known details, such as steam jacket, grooves or springs in thepistons, cocks, and the like.

Having now fully described the nature of our said invention and in Whatmanner the same is to be performed,we declare that what we claim 1s- 1.The combinatiomwith the cylinder O,having end gro0ves,a a, steam-inletDbetween its 5 ends, and an exhaust, of the hollow or tubular piston K,having closed ends and longitudinal openings 1) b, communicating withgrooves a a when the piston is at the extremes of its movement, theinterior of the cylinder always I00 communicating with the steam-inletD, the exhaust being closed by the side walls of the piston until theends of the piston pass thereby in both directions, substantially as setforth. 5 2. Thecombination,with theeylinder O,hav-

, in end moves a a steam-inlet D between- D b i 7 the grooves, and anexhaust, c c, at ppposite sides of the inlet D, of the hollow piston K,closed at its ends and having longitudinal r0 openings 1) b, connectingthe interior of the cylinder at all times with the inlet D, andconnecting it with the grooves a a, respectively, at the. extremes ofits movement, both exhaust-ports being closed by the side wall of v rthe piston and opened successively as the pistwo subscribing witnesses.

JOHANN CARL GRABNER. HENRI RUPERTI.

Witnesses:

DAGOBERT ScHoURY, CARL KUHN.

